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-rw-r--r--testsuite/mk/test.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/testsuite/mk/test.mk b/testsuite/mk/test.mk
index aa20a42a65..97ceb39cb9 100644
--- a/testsuite/mk/test.mk
+++ b/testsuite/mk/test.mk
@@ -34,7 +34,7 @@ endif
# TEST_HC_OPTS is passed to every invocation of TEST_HC
# in nested Makefiles
-TEST_HC_OPTS = -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-$(GhcPackageDbFlag) -rtsopts $(EXTRA_HC_OPTS)
+TEST_HC_OPTS = -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -fshow-warning-groups -no-user-$(GhcPackageDbFlag) -rtsopts $(EXTRA_HC_OPTS)
# The warning suppression flag below is a temporary kludge. While working with
# tests that contain tabs, please de-tab them so this flag can be eventually